If I remember correctly, use A and D to traverse (faster than mouse) and shoot when they come at you. You do have infinite ammo, though, so there's no reason not to blaze away. If a fighter is below the bottom attitude plane of the turret then just ignore it till it comes back into range.

If the Sith were smart they'd just attack the Hawk's ventral, but thankfully for us they're retarded and attack right at the overpowered turret.

"Do what you can reasonably, and leave the rest to God." --Fr. Joe Quigley